1221105493 has 2 divisors, whose sum is σ = 1221105494. Its totient is φ = 1221105492.

The previous prime is 1221105481. The next prime is 1221105539. The reversal of 1221105493 is 3945011221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1058721444 + 162384049 = 32538^2 + 12743^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221105493 - 2⁹ = 1221104981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221105463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610552746 + 610552747.

It is an arithmetic number, because the mean of its divisors is an integer number (610552747).

Almost surely, 2^1221105493 is an apocalyptic number.

It is an amenable number.

1221105493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221105493 is an equidigital number, since it uses as much as digits as its factorization.

1221105493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1221105493 is about 34944.3198960861. The cubic root of 1221105493 is about 1068.8523791987.

The spelling of 1221105493 in words is "one billion, two hundred twenty-one million, one hundred five thousand, four hundred ninety-three".